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See detailPerturbation technique for the finite element modelling of differential probes in non-destructive eddy-current testing
V Sabariego, Ruth ULg; Dular, Patrick ULg

in IET Science, Measurement & Technology (2007), 1(1), 25-29

The paper deals with a new finite element scheme for non-destructive eddy-current testing (ECT) problems involving multiply connected test pieces and differential probes. It concerns a perturbation ... [more ▼]

The paper deals with a new finite element scheme for non-destructive eddy-current testing (ECT) problems involving multiply connected test pieces and differential probes. It concerns a perturbation technique applied to the magnetodynamic h - phi formulation. The unperturbed field (in the absence of the flaw) is conventionally computed in the complete domain. The source of the perturbation problem is then determined by the projection of the unperturbed field in a relatively small region around the defect, the optimum size of which depends on the working frequency. The discretisation of this reduced domain is well adapted to the size of the defect and chosen independently of the dimensions of the excitation probe and the specimen under study. At a discrete level, the voltage change is efficiently computed by integration only over the defect and a layer of elements in the reduced domain that touches the defect's boundary. The accuracy of the proposed perturbation model is illustrated by comparison of the results obtained for different dimensions of the reduced domain with those achieved in the conventional way. The considered test case involves a differential probe scanning the outer surface of a metal tube for the detection of through-wall cracks. [less ▲]

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See detailTime Dependent Convection vs. Frozen Convection Approximations
Grigahcène, A.; Dupret, Marc-Antoine ULg; Garrido, R.

in EAS Publications Series (2007)

The approximation known as Frozen Convection has been widely used in the context of stellar oscillations due to the lack of a Time Dependent Convection theory. This approximation supposes to neglect the ... [more ▼]

The approximation known as Frozen Convection has been widely used in the context of stellar oscillations due to the lack of a Time Dependent Convection theory. This approximation supposes to neglect the interaction between convection and oscillations and there are different ways to do it. The choice can affect theoretical predictions concerning the non-adiabatic treatment of the stellar oscillations. In fact, fictitious excitation or damping of the pulsation modes can be produced depending on the approximation used. [less ▲]

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See detailIncreasing seed oil content in oil-seed rape (Brassica napus L.) by over-expression of a yeast glycerol-3-phosphate dehydrogenase under the control of a seed-specific promoter.
Vigeolas, Hélène ULg; Waldeck, Peter; Zank, Thorsten et al

in Plant Biotechnology Journal (2007), 5(3), 431-41

Previous attempts to manipulate oil synthesis in plants have mainly concentrated on the genes involved in the biosynthesis and use of fatty acids, neglecting the possible role of glycerol-3-phosphate ... [more ▼]

Previous attempts to manipulate oil synthesis in plants have mainly concentrated on the genes involved in the biosynthesis and use of fatty acids, neglecting the possible role of glycerol-3-phosphate supply on the rate of triacylglycerol synthesis. In this study, a yeast gene coding for cytosolic glycerol-3-phosphate dehydrogenase (gpd1) was expressed in transgenic oil-seed rape under the control of the seed-specific napin promoter. It was found that a twofold increase in glycerol-3-phosphate dehydrogenase activity led to a three- to fourfold increase in the level of glycerol-3-phosphate in developing seeds, resulting in a 40% increase in the final lipid content of the seed, with the protein content remaining substantially unchanged. This was accompanied by a decrease in the glycolytic intermediate dihydroxyacetone phosphate, the direct precursor of glycerol-3-phosphate dehydrogenase. The levels of sucrose and various metabolites in the pathway from sucrose to fatty acids remained unaltered. The results show that glycerol-3-phosphate supply co-limits oil accumulation in developing seeds. This has important implications for strategies that aim to increase the overall level of oil in commercial oil-seed crops for use as a renewable alternative to petrol. [less ▲]

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See detailEnergies et développement durable
Merenne-Schoumaker, Bernadette ULg

in Veyret, Yvette (Ed.) Le développement durable (2007)

L’énergie est une des composantes essentielles du développement durable et ce dans ses quatre dimensions : économique, sociale, environnementale et gouvernance. L'objectif de cette contribution à un ... [more ▼]

L’énergie est une des composantes essentielles du développement durable et ce dans ses quatre dimensions : économique, sociale, environnementale et gouvernance. L'objectif de cette contribution à un ouvrage sur le développement durable est de rappeler quelques notions de base sur l'énergie puis d'évoquer les ressources énergétiques d'aujourd'hui et de demain et enfin de mettre en évidence les grands enjeux : consommer mieux avec moins, réduire les inégalités dans le monde et responsabiliser les acteurs tout en renforçant la gouvernance mondiale [less ▲]

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See detailL'intégration par les jeunes des stéréotypes sexistes véhiculés par les médias
Dizier, Céline; Nibona, Marjorie; Willems, Isabelle et al

Report (2007)

Le rapport analyse la manière dont les stéréotypes sexistes sont diffusés dans les médias, notamment par les situations et par l'image. Il présente également une enquête sur les jeunes pour percevoir la ... [more ▼]

Le rapport analyse la manière dont les stéréotypes sexistes sont diffusés dans les médias, notamment par les situations et par l'image. Il présente également une enquête sur les jeunes pour percevoir la façon dont ces stéréotypes sont intégrés ou mis en distance en fonction des pratiques de consommation médiatique mais aussi du contexte. [less ▲]

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See detailLes nouveaux concepts du développement territorial : une mode ou de nouveaux paradigmes ?
Merenne-Schoumaker, Bernadette ULg

in Van Nuffel, Nathalie (Ed.) Van Christaller tot Wallerstein. Liber Amicorum Prof. Dr. Pieter Saey (2007)

Recent transformations have drastically changed the way of thinking and organising territories' future. This article attempts to emphasize and criticize the new concepts that are currently founding the ... [more ▼]

Recent transformations have drastically changed the way of thinking and organising territories' future. This article attempts to emphasize and criticize the new concepts that are currently founding the territorial development in terms of jurisdiction, territorial intelligence, attractivity and competitiveness. It also focuses on new factors (innovation, training, network, identity, strategic management and governance) and development tools, such as competitiveness poles. [less ▲]

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See detailLa localisation des grandes zones logistiques
Merenne-Schoumaker, Bernadette ULg

in Bulletin de la Société Géographique de Liège (2007), (49), 31-40

The growth of logistics has recently fathered many new zones of specialized activities, called most of the times parks or logistic platforms. The objective of the article consists in understanding their ... [more ▼]

The growth of logistics has recently fathered many new zones of specialized activities, called most of the times parks or logistic platforms. The objective of the article consists in understanding their development and in identifying the logics of location. For this purpose, we have first tried to identify better the domain of activities: types of logistics, carried out operations, concerned sectors, concerned operators... Afterwards, on the basis of data mostly coming from professional circles, we have attempted to identify the factors and constraints of the new zones location, and to specify the mechanisms of the new real estate business linked to those zones, our goal consisting in bringing out the main principles of location on the scale of the countries, regions and sites choices. In the light of this first analysis, the logic seems pretty specific and takes place undoubtedly between the logic of industries and services. [less ▲]

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See detailEconomie de marché, régulations sectorielles et droit économique
Thirion, Nicolas ULg

in Thirion, Nicolas (Ed.) Libéralisations, privatisations, régulations. Aspects juridiques et économiques des régulations sectorielles. Marchés financiers - Télécoms - Médias - Santé (2007)

Etude destinée à introduire un ouvrage interdisciplinaire (droit / économie) sur les effets des régulations sectorielles sur l'ordre économique et polique des Etats membres de l'Union européenne

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See detailGéographie de l'énergie. Acteurs, lieux et enjeux
Merenne-Schoumaker, Bernadette ULg

Book published by Belin Sup Géographie (2007)

L'énergie est au cœur de nombreux débats où se combinent différentes problématiques comme l'accès aux ressources et le développement de technologies nouvelles, la maîtrise des marchés et des prix, le ... [more ▼]

L'énergie est au cœur de nombreux débats où se combinent différentes problématiques comme l'accès aux ressources et le développement de technologies nouvelles, la maîtrise des marchés et des prix, le contrôle des réseaux, le développement durable, la réduction des inégalités entre les hommes et les territoires, voire la survie de l'humanité. Ce thème d'actualité ne peut laisser personne indifférent. D'où la multiplication de travaux émanant tant de spécialistes du monde scientifique, du monde professionnel, d'organismes publics et privés, nationaux ou internationaux mais aussi de groupes de pression, d'associations de citoyens…Face à cette multitude d'informations, aujourd'hui de plus en plus aisément accessibles grâce à Internet, il est bien difficile de cerner l'ensemble des problèmes. L'objet de ce livre est dès lors d'être un guide pour mieux appréhender les différentes facettes (techniques, économiques, politiques, environnementales…) de l'énergie en privilégiant l'entrée spatiale, c'est-à-dire les territoires où s'opèrent les productions et les consommations, l'organisation des marchés et le jeu des acteurs de même que les impacts environnementaux des différents choix. [less ▲]

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See detailLa régulation économique et ses implications juridiques: enjeux et débats
Thirion, Nicolas ULg

in Thirion, Nicolas; Peltzer, Patrick (Eds.) La régulation économique dans la vie des affaires (2007)

Etude destinée à identifier les différentes questions juridiques auxquelles donne lieu un processus de libéralisation/ régulation d'un secteur économique

Detailed reference viewed: 51 (15 ULg)
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See detailAftermath of the late Frasnian mass extinction (Upper Devonian) on brachiopods in the Namur-Dinant Basin (Belgium).
Mottequin, Bernard ULg

in Budd.; Streng, M.; Daley, A. C. (Eds.) et al Programme with abstracts of the 51st Palaeontological Association Annual Meeting (2007)

Detailed reference viewed: 36 (10 ULg)
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See detailVector versus Scalar Spatial Solitons in Microstructured Optical Fibres
Drouart, F.; Nicolet, A.; Renversez, G. et al

in Proceedings of the 16th Conference on the Computation of Electromagnetic Fields, COMPUMAG 2007 (2007)

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See detailMutational Analysis Of The Tre2 Oncogene Encoding An Inactive Rabgap
Bizimungu, C.; Thomas, Annick ULg; Brasseur, Robert ULg et al

in Biotechnology Letters (2007), 29(12), 1927-37

The TRE2 oncoprotein is structurally related to the RabGAP (GTPase-activating protein) family. However, TRE2 seems enzymatically inactive. Two regions are important for its lack of GAP activity. First ... [more ▼]

The TRE2 oncoprotein is structurally related to the RabGAP (GTPase-activating protein) family. However, TRE2 seems enzymatically inactive. Two regions are important for its lack of GAP activity. First, the TBC domain, forming the catalytically active domain of RabGAPs, is non-functional in the oncoprotein. Also involved in TRE2 inactivity is the 93-aa region flanking the TBC domain on the C-terminal side. In order to identify the residues responsible for non-functionality, we performed hydrophobic cluster analysis of the oncoprotein sequence, combined with secondary structure prediction, receptor-binding domain analysis, and a tilted peptide calculation. These analyses were complemented with site-directed and random mutagenesis experiments. On the basis of our data, we hypothesize that the lack of secondary structure of the region flanking the TBC domain in TRE2 may explain why this region plays a role in the lack of GAP activity, even when a potentially functional TBC domain is present. [less ▲]

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See detailCaractérisation des perturbations extracellulaires induites au sein des réacteurs scale-down par la superposition d'une approche expérimentale et d'une approche numérique
Delvigne, Frank ULg; Crine, Michel ULg; Toye, Dominique ULg et al

in Récents Progrès en Génie des Procédés - N°95 - Actes des 5èmes Journées francophones sur les réacteurs gaz-liquide et gaz-liquide-solide, 12-15 juin 2007, Carry-le-Rouet, France (2007)

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See detailDe novo C16- and C24-ceramide generation contributes to spontaneous neutrophil apoptosis.
Seumois, Gregory; Fillet, Marianne ULg; Gillet, Laurent ULg et al

in Journal of Leukocyte Biology (2007), 81(6), 1477-1486

Neutrophils rapidly undergo spontaneous apoptosis following their release from the bone marrow. Although central to leukocyte homeostasis, the mechanisms that regulate neutrophil apoptosis remain poorly ... [more ▼]

Neutrophils rapidly undergo spontaneous apoptosis following their release from the bone marrow. Although central to leukocyte homeostasis, the mechanisms that regulate neutrophil apoptosis remain poorly understood. We show here that apoptosis of cultured neutrophils is preceded by a substantial increase in the intracellular levels of 16 and 24 carbon atom (C(16)- and C(24))-ceramides, which are lipid second messengers of apoptosis and stress signaling. Treatment of neutrophils with fumonisin B(2), a selective inhibitor of the de novo pathway of ceramide synthesis, prevented accumulation of C(16)- and C(24)-ceramides. Moreover, fumonisin B(2) significantly reduced caspase-3, -8, and -9 activation and apoptosis in these cells. Conversely, 3-O-methylsphingomyelin and fantofarone, which are specific inhibitors of neutral and acid sphingomyelinases, respectively, neither inhibited C(16)- and C(24)-ceramide production nor decreased the apoptosis rate in neutrophils, indicating that in these cells, ceramides are not generated from membrane sphingomyelin. Further experiments showed that increasing endogenous C(16)- and C(24)-ceramide levels by using DL-threo-1-phenyl-2-palmitoylamino-3-morpholino-1-propanol and (1S,2R)-D-erythro-2-(N-myristoylamino)-1-phenyl-1-propanol, two inhibitors of ceramide metabolism, enhances caspase-3, -8, and -9 activity and increases neutrophil apoptosis. Similarly, apoptosis was induced rapidly when synthetic C(16)- and/or C(24)-ceramides were added to neutrophil cultures. Finally, GM-CSF, a cytokine that delays neutrophil apoptosis, abrogated C(16)- and C(24)-ceramide accumulation totally in cultured neutrophils, whereas Fas ligation accelerated apoptosis in these cells without affecting de novo ceramide production. We conclude that de novo generation of C(16)- and C(24)-ceramides contributes to spontaneous neutrophil apoptosis via caspase activation and that GM-CSF exerts its antiapoptotic effects on neutrophils, at least partly through inhibition of ceramide accumulation. [less ▲]

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See detailImpact of Transport and Dynamical Processes Upon Stellar Oscillation Frequencies
Goupil, M. J.; Dupret, Marc-Antoine ULg

in EAS Publications Series (2007)

In order to prepare the theoretical interpretation of the oscillation frequencies detected by CoRoT, comparisons of results from standard stellar models by the ESTA group have proven to be very useful ... [more ▼]

In order to prepare the theoretical interpretation of the oscillation frequencies detected by CoRoT, comparisons of results from standard stellar models by the ESTA group have proven to be very useful. The next issue which is briefly addressed here is ``what are the additional physical processes that must be included in stellar models computed with different evolutionary codes for the next comparison exercises?'' We therefore discuss the impact on oscillation frequencies of several physical processes which are still poorly understood and/or poorly modelled but cannot be fully discarded. [less ▲]

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See detailDe quelques mots dont on nous paie
Durand, Pascal ULg

in Quaderni : la Revue de la Communication (2007)

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See detailEnhanced vortex trapping by a composite antidot lattice in a superconducting Pb film
Silhanek, Alejandro ULg; Van Look, L.; Jonckheere, R. et al

in Physica C: Superconductivity (2007), 460

Using electrical transport measurements, we study a composite antidot lattice consisting of two interpenetrating antidot square arrays with a different antidot size and the same lattice period. We show ... [more ▼]

Using electrical transport measurements, we study a composite antidot lattice consisting of two interpenetrating antidot square arrays with a different antidot size and the same lattice period. We show that placing an additional small antidot in the unit cell of the array a higher number of flux quanta per unit cell can be trapped inside the antidots, compared to a reference antidot film without the additional small antidots. As a consequence, the field range in which an enhanced critical current is observed is considerably expanded. (c) 2007 Elsevier B.V. All rights reserved. [less ▲]

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See detailAvant-propos
Guillaume, Jean-François ULg

in Puzzle (2007), 23

Le texte présente les grandes thématiques abordées dans le cadre de l'Université d'Eté 2007 du Centre Interfacultaire de Formation des Enseignants de l'Université de Liège, ainsi qu'une exploitation des ... [more ▼]

Le texte présente les grandes thématiques abordées dans le cadre de l'Université d'Eté 2007 du Centre Interfacultaire de Formation des Enseignants de l'Université de Liège, ainsi qu'une exploitation des réponses aux situations-problèmes présentées aux participants. La notion d'autorité et ses usages sont plus particulièrement critiqués. [less ▲]

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